Update OpenSSF badge link in readme-md-template.md

[AlanGraham]

OpenSSF have provided a way to link to a nicer page of your OpenSSF score. https://api.securityscorecards.dev/projects/github.com/apache/commons-@ID@ -> https://scorecard.dev/viewer/?uri=github.com/apache/commons-@ID@

So rather than a json blob, the link can now go to a nicely formatted page which also links to information on some of the items on what is needed to improve the score.

Thanks for your contribution to Apache Commons! Your help is appreciated!

Before you push a pull request, review this list:

• Read the contribution guidelines for this project.
• Read the ASF Generative Tooling Guidance if you use Artificial Intelligence (AI).
• I used AI to create any part of, or all of, this pull request. Which AI tool was used to create this pull request, and to what extent did it contribute?
• Run a successful build using the default Maven goal with mvn; that's mvn on the command line by itself.
• Write unit tests that match behavioral changes, where the tests fail if the changes to the runtime are not applied. This may not always be possible, but it is a best practice.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Each commit in the pull request should have a meaningful subject line and body. Note that a maintainer may squash commits during the merge process.

[AlanGraham]

Not sure if I should have added an example to summary too.
https://scorecard.dev/viewer/?uri=github.com/apache/commons-@ID@
resolves to
https://scorecard.dev/viewer/?uri=github.com/apache/commons-validator if placeholder replaces as I understand it :).